Nickel-tungsten sulfides nanostructures assembled nitrogen-doped graphene as a novel catalyst for effective oxygen reduction reaction

Abstract Here we propose a novel nanohybrid of bimetallic nickel‑tungsten sulfides nanostructures uniformly distributed on nitrogen-doped graphene with efficient ORR performance in 0.1 M KOH electrolyte. The material exhibits high limit current density, positive onset potential (+0.97 V) and half-wave potential (+0.82 V), and a small Tafel slope of 101 mV/dec, which are comparable to a commercial Pt/C (20 wt%). In addition, the material also shows superior stability, durability, and methanol tolerance than those of the Pt/C. The good performance can be credited to the synergistic effects of bimetallic nickel‑tungsten sulfides, which lead to the modification of electronic structure with the enhanced electroactive sites for ORR. In addition, the large surface area and high conductivity of nitrogen-doped graphene stably disperse active metals with good interaction to effectively avoid reaggregation/agglomeration and promote the charge transfer at the interface. The achieved results of this work present efficient and durable electrocatalyst, highly potential towards ORR in alkaline fuel cell applications.

• Publication year

  2019

• Venue

  Journal of Electroanalytical Chemistry

• Publication date

  2019-09-01

• Fields of study

  Materials Science, Chemistry

• Identifiers
  DOI 10.1016/J.JELECHEM.2019.113343
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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